Improved screw-driver



"UNITED STATES PATENT OFFICE.

GYRUS EVERSOL, OF OOMMERGEJMISSOURI.

IMPROVED SCREW-DRIVER.

Specication forming part of Letters Patent No. 57,107, dated August 14, 1866.

To all whom it may concern:

Be it` known that I, GYRUS EVERSOL, of Commerce, Scott county, State of Missouri, have inveu ted a new and useful Improvement in Screw-Dri vers 5 and I do hereby declare that the following isa full, clear, and exact description thereof,` which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawings, Forming part of this specitcation, in which- Figure l is a side View of my improved screwdriver, partly in section, to show the construction of the handle. Fig. 2 is a bottom or edge View -of my improved screwdriver. l Fig. f5 isanaendord'ead View of my improved screw. Fig. 4 is a cross-section of my improved screw-driver, taken through the line x x, Fig. 1.

Similar letters of reference indicate like parts.

My invention has for its object to furnish an improved screw-driver, so constructed and arranged as to be strong, serviceable, and couvenient, and free from any liability to split the head of the screw in operating it; and it consists, first, in forming `the face or edge of the screw-driver in the form of a cross with equal arms, so as to fit into the head of the screw; and, secondly, in combining with the handle of the screw-driver a ratchet-Wheel and pawls, as hereinafter more fully described.

A is the screw, which is made in the usual form, except that the head is formed with two notches crossing each other atrightlangles, as shown in Fig. 3. When formed -in Jthis way the notches in the head of the screw do not require to he so deep to enable the driver to takea firm Ahold. upon the head of the screw' to operate it as is necessary when the head oi' the screw is formed in the ordinary manner.

B is the shank or blade of the screw-driver, the edge or face of which is made in the'form of a cross with equal arms, as shown in Fig. 2, so as to it into the double notch in the head of the screw. l

The shank or blade B of the screw-driver is made detachable from the handle C, as shown in Fig. l, and is held in place in the socket of the handle in the same manner as bits are now ordinarily held in the socket of the brace.

To the upper end of the hub c of the handle U is attached a shank, e2, running longiheld by the pawl from turning in either direction, as desired. The pawl E is pivoted to the projecting part of the case c3, as shown in Figs. I and 4.

In using the screw-driver to drive a screw, the foren ger of the hand that holds the screwdriver is placed upon the proper end of the pawl, and the screw may be forced in its whole length without shifting the hand. To draw out the screw the finger is shifted tothe other end of the pawl andthe screw drawn outwith the same facility.

I claim as new and desireto secure by Letters Patent- 1. Forming the face or edge of the screwdriver B in the form of a cross with equal arms, substantially as described, and for the purpose set forth.

2. The combination, with the handle C of the screw-driver, of a ratchet-wheel, D, and pawl E, constructed and operated substantially as described, and `for the purpose set forth.

(JYRUS EVERSOL.

i Witnesses:

GEORGE H. WATSON, CARROLL MoYE.-

This shank c2, or at least that part of 

